If you have a corporate T-Mobile store in mind give them a call. I see your post has been here for 2 days. All my transactions with a T-Mobile has been with a credit card. Hope that helps.
I agree with the suggestion above. I'm only seeing card payment options but you're welcome to contact our store to double check your options.
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You might want to check your state's laws. Some jurisdictions require businesses to accept at least two forms of payment (e.g. Credit card or cash, cash or check). If your state has a law like this, T-Mobile could get in trouble for non-compliance if they don't.